Copper Alloy C65500-H04 vs C65500-O
Copper Alloy · C65500 temper comparison
C65500-H04 and C65500-O are two conditions of the same copper alloy grade, C65500: H04 (full hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. C65500-H04 is the stronger of the two: yield strength 450 MPa (65.3 ksi) against 165 MPa (23.9 ksi) for C65500-O, about 173% more; tensile strength follows at 660 MPa (95.7 ksi) vs 400 MPa (58 ksi). In exchange, C65500-O is the more ductile: elongation 60% versus 13% for C65500-H04, and C65500-H04 is harder (185 HB vs 78 HB). C65500-O runs hotter in service (200°C vs 150°C continuous).
C65500-H04Choose it when strength drives the design.
C65500-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C65500-H04 vs C65500-O: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 103 GPa14.9 Msi · Shear Modulus 38.6 GPa5.6 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.34 · Reduction in Area 55% · Charpy V-Notch Impact (RT) 80 J59 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 8.53 g/cm³0.31 lb/in³ · Melting Point (Solidus) 971°C1,780 °F · Liquidus Temperature 1,019°C1,866 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 36 W/m·K20.8 BTU/hr·ft·°F · Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 18 µm/m·K10 µin/in·°F · Latent Heat of Fusion 210 J/g90.3 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.46×10⁻⁷ Ω·m9.69 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.27 V · Corrosion Resistance 72 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 30% · Weldability 92 / 100 · Castability 55 / 100 · Brazeability / Solderability 85 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 4 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 40%
Strength versus weight
Yield strength against density for every copper alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
C65500-H04 vs C65500-O — frequently asked
Is C65500-H04 stronger than C65500-O?
Yes. C65500-H04 has a typical yield strength of 450 MPa (65.3 ksi) against 165 MPa (23.9 ksi) for C65500-O — about 173% more. Tensile strength is 660 MPa (95.7 ksi) vs 400 MPa (58 ksi).
Which condition does FabDigit quote by default, H04 or O?
O is the default C65500 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, C65500-H04 or C65500-O?
C65500-H04. Its machinability rates fair (36/100) against poor (28/100) for C65500-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C65500-H04 and C65500-O side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.